EP1590869A2 - Electric converter for fuel cell - Google Patents
Electric converter for fuel cellInfo
- Publication number
- EP1590869A2 EP1590869A2 EP04707964A EP04707964A EP1590869A2 EP 1590869 A2 EP1590869 A2 EP 1590869A2 EP 04707964 A EP04707964 A EP 04707964A EP 04707964 A EP04707964 A EP 04707964A EP 1590869 A2 EP1590869 A2 EP 1590869A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- voltage
- current
- inverter means
- converter according
- fuel cell
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/30—The power source being a fuel cell
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0083—Converters characterised by their input or output configuration
- H02M1/0087—Converters characterised by their input or output configuration adapted for receiving as input a current source
Definitions
- the invention relates to an electrical converter for a fuel cell.
- Fuel cells are used as a source of electrical energy in many applications. They are proposed, among other things, as energy sources in electric motor vehicles (cars, buses, electrically propelled boats, etc.) to replace internal combustion engines. It is then possible to reduce the local pollution generated by motor vehicles.
- a fuel cell is an electrochemical generator whose electrodes are continuously supplied with fuel and oxidant.
- the technology chosen is mainly the PEMFC technology for fuel cells with proton exchange membranes supplied with hydrogen, on the one hand, and with oxygen from the air, on the other hand (PEMFC for "Proton Exchange Membrane Fuell Cell”).
- the hydrogen used can be stored in a tank on board the vehicle. It is then hydrogen which is used as an energy carrier in chemical form.
- the fuel cell converts this chemical energy into electrical energy necessary for the electric motors of the vehicle.
- the hydrogen used can also be produced at on board the vehicle from hydrocarbons thanks to a reforming circuit.
- This solution provides better efficiency than the internal combustion engine in the driving phases where the power requirement is low.
- a fuel cell is a particular electric generator because each cell element provides a very low direct voltage of the order of 0.5 volts to 0.8 volts when charged.
- a large number of cells are associated in series. For example, stacking a hundred cells in series allows an operating voltage under load of the order of 60 to 80 volts.
- several stacks of cells in series are used. These stacks are associated in series and / or in parallel.
- the electrical energy produced is not directly adapted to the use.
- the fuel cell does not provide a constant voltage, on the other hand, the supplied voltage is low.
- Electric motors use alternating voltages internally. It is the variations in direction of these voltages that allow the rotation of the magnetic field which is produced by electric currents. This rotating magnetic field drives the motor in rotation.
- DC motors the generation of alternating voltages from a DC voltage has in the past been achieved by segmented brush and manifold systems. Today, for performance and service life aspects, mechanical switching by segmented brushes and collectors is most often replaced by a transistor inverter. Then generated for the motor windings three sinusoidal alternating currents of the same amplitude and phase shifted between them by 2 ⁇ / 3, which allow to produce a rotating magnetic field of constant amplitude. It is then possible to obtain a rotation of the motor without sudden torque.
- the voltage inversion necessary to generate the alternating voltage from direct voltage is slowed down by the inductance of the motor windings and cables. This physical phenomenon is all the more annoying when the operating voltage of the motor is low.
- a low voltage corresponds to a high current, therefore a high energy stored in the internal inductances of the motor and in the wiring.
- An electrical power supplied in the form of a low voltage and a high current is also an important constraint for the dimensioning and the losses of the collectors and brushes or of the electronic converter fulfilling this function.
- the operating voltage of the motor is high (typically greater than 100 volts and, often, of the order of 200 or 400 volts AC).
- FIG. 1 illustrates the variation in voltage Vp present at the terminals of a fuel cell as a function of the current I supplied by the cell.
- a first zone (I) is a zone for activating the electrodes of the battery in which the voltage Vp drops quickly when the current increases. It then appears on the electrodes a voltage drop with respect to the voltage Uo.
- a third zone (III) appears, called the diffusion zone, in which the fuel cell is limited in current by the diffusion speed of the fuels and oxidizers inside the cell. . In the diffusion zone, the voltage decreases sharply while the current increases little.
- a stack of one hundred cells in series has a no-load voltage of lOOxUo, or approximately 120 volts. Under load, the operating voltage can then drop to voltages of the order of 80 volts or 60 volts. A higher voltage corresponds to a better efficiency, but to a lower power supplied. Depending on the application, the yield or the power density (therefore the cost) will be preferred.
- the electrical architecture of a vehicle must take account of the two constraints linked to the fuel cell, namely the low DC voltage of the unit cell element and the large voltage variation.
- Usual applications often require one or more converters of electrical energy, as well as buffer storage means for this electrical energy.
- the converter increases the voltage from the battery. Indeed, most power supplies for vehicles require an operational voltage which must be higher than the supply voltage supplied by a fuel cell. As a result, a DC / DC step-up converter is necessary to raise the voltage delivered by a fuel cell to the required voltage level.
- the tension supplied from a fuel cell is used directly.
- the fuel cell supplies a voltage of the order of 200-400 volts to supply, in particular, the vehicle traction, the air conditioning, as well as a 12 volt battery via a bidirectional converter.
- the 12 volt voltage is used to power traditional loads such as lamps and electronic controls.
- the voltage supplied at the output of a fuel cell is converted into a perfectly regulated or slightly variable voltage (voltage of a buffer battery for example).
- Figure 2 illustrates the case of the perfectly regulated voltage.
- a converter C is placed at the output of the fuel cell P and a bidirectional converter Cb is placed upstream of a battery B.
- the converter C and the bidirectional converter Cb are mounted on a voltage bus T.
- the bidirectional converter Cb a a regulatory effect since it can supply or absorb energy. This way you get a perfectly tension regulated, as long as the power limits of the converters and the storage limits are not reached
- FIG. 3 illustrates the case of the slightly variable voltage.
- the battery B is here directly connected to the voltage bus T.
- the battery having a slightly variable voltage, it is this which imposes the voltage of the bus.
- This variant is described, for example, in patent EP 1 091 437.
- Current electric vehicles require two voltage sources, one being a high voltage (for example 400V DC) and the other a low voltage (for example 12V continuous).
- US Patent 6,177,736 discloses an example of a converter generating these two voltages. Using an elevator chopper assembly, the voltage delivered by a fuel cell is transformed into two voltages, of 400V and 12V respectively.
- FIG. 4 represents a lifting chopper according to the prior art.
- the step-up chopper comprises at least one switch K, a diode D, an inductance L and an output capacitor Cd.
- Such a chopper is said to accumulate.
- the switch When the switch is closed, the current increases in the inductance which then stores energy in the form electromagnetic.
- the switch opens, the voltage rises across its terminals until the diode turns on. The inductance then gives up at the output part of the energy it has stored in the form of a higher voltage.
- the switch does not switch, the output voltage is equal to the input voltage due to the conduction of the diode. If the switch switches, the storage and transfer of energy from the inductor makes it possible to provide the energy output as a higher voltage.
- the output voltage is always higher than the input voltage. This implies that the output voltage of the fuel cell is, at all times, lower than the voltage of the discharged battery or the regulated voltage.
- An elevator chopper stage cannot provide short-circuit protection for the fuel cell.
- a short circuit at the output of the lifting chopper results in a short circuit of the battery, which may not support it.
- An auxiliary switch is required to open quickly in the event of a short circuit. It is then necessary to integrate a protection such as a circuit breaker, a relay or an auxiliary transistor.
- the reduction in the size of a lifting chopper leads to an increase in the frequency of use due to the reduction in the size of the components. It is also necessary to improve the cooling of the circuit to extract the heat produced in a reduced volume.
- FIG. 5 represents a second example of a DC / DC converter according to the prior art.
- the DC / DC converter comprises an inverter W followed by a transformer Z, a diode bridge Pt, a smoothing inductor Ls and an output capacitor Cs.
- the inverter W transforms the DC voltage from the battery into an AC voltage applied to the transformer Z.
- the diode bridge rectifies the AC voltage to make it a DC voltage.
- the smoothing inductance Ls smooths the DC voltage.
- the advantage of this converter is the use of a transformer which allows, without oversizing, to achieve high elevation coefficients between the input voltage and the output voltage.
- the transformer transfers energy directly between its primary and secondary. Unlike the inductor, it must not store a strong electromagnetic energy. As a result, high power transformers operating at high frequency are easier to produce than inductors.
- the windings can be designed to have low eddy current losses even at high frequency (> 50 KHz).
- the assembly using an inverter and a transformer supports short circuits and limits the current at its output. In the event of a short circuit, the battery is protected. This assembly is powered by the fuel cell, the voltage of which is highly variable. The components of the inverter, the diodes and the transformer must be oversized accordingly.
- the invention does not have the drawbacks mentioned above.
- the invention relates to an electrical converter for a fuel cell comprising current inverter means.
- the converter comprises a step-down chopper mounted between the fuel cell and the current inverter means and control means for delivering a control signal applied to switching means of the step-down chopper so that, under the action of the control signal:
- the value of the average voltage at the input of the current inverter means is lowered to a threshold value in a first zone of operation of the battery called the zone of activation of the electrodes of the cell,
- the value of the average input voltage of the current inverter means is maintained at the voltage value at the terminals of the battery in a second operating zone called the battery resistance zone, and
- the converter output current is limited when the current at the output of the current inverter means reaches a maximum set value.
- the current inverter means are controlled so that the value of the peak voltage delivered by the inverter is substantially equal to the threshold value.
- the converter comprises at least one transformer at the output of the current inverter means.
- the transformer is a step-up transformer.
- the current inverter means comprise a bridge of four switches.
- the current inverter means are of the push-pull type with two switches.
- the converter comprises first and second transformers and the current inverter means comprise first and second switches, so that the first switch is mounted in series with the primary winding of the first transformer and the second switch is mounted in series with the primary winding of the second transformer, the secondary windings of the first and second transformers being connected in parallel.
- the first and second transformers are in planar technology.
- the converter comprises a rectifier.
- the rectifier comprises sets of diodes mounted in series or in a diode array.
- the step-down chopper comprises at least one switch in IGBT technology.
- the current inverter means comprise MOSFET transistors.
- the converter comprises filtering means.
- the electric converter for fuel cell according to the invention has many advantages.
- the switching means of the step-down chopper comprise at least one switch.
- the voltage step-down chopper switch supports the maximum voltage from the fuel cell.
- the current inverter means can then be dimensioned for the value of the threshold voltage which is lower than the maximum voltage. If the inverter means use a full bridge with four switches, the voltage to be taken into account for dimensioning is the threshold voltage. If the inverter means are of push-pull type with two switches, the stress is twice the threshold voltage but, on the other hand, the average current stress can be halved.
- the step-down chopper switch is in the on state during the largest operating range of the converter. It can then be chosen in a technology which minimizes conduction losses, for example according to the IGBT type technology with low voltage drop. In this case, during the operation of the fuel cell in zone (I), the low current level during the switching phases makes it possible to keep the switching losses at a very low level.
- MOSFETs for “Metal-Oxide Semiconductor Field Effect Transistor”
- MOSFETs for “Metal-Oxide Semiconductor Field Effect Transistor”
- MOSFETs are well suited for making converters operating at high frequency.
- parasitic resistance in the passing state increases very quickly with the voltage. In practice, this parasitic resistance leads to the use of several transistors in parallel to switch high currents.
- the fitting inductance of the assembly advantageously has very little energy to store and to exchange.
- the step-down chopper switch switches, the current is low and, consequently, the energy managed by the inductor is low.
- the current inverter means raise the voltage by the simultaneous conduction phase of the switches, the rise coefficient (ratio between the threshold voltage Vs and the voltage Vp across the battery) is very low and the energy managed by the inductor is consequently also very low.
- the output diodes conduct with a conduction time close to 50% which limits their peak current, the level of reverse recovery current during their blocking and the associated losses.
- the operation of the transformer under defined voltage with very little variation in the durations of the phases of the inverter means, makes it possible to size the transformer with an excursion in magnetic induction close to the maximum excursion of the magnetic materials and this without risk of saturation in phases converter operating transients.
- the presence of the transformer makes it possible to provide an output voltage much higher than the input voltage without any particular constraint. It is possible to use a technology transformer planar which is well suited to high operating frequencies and which can be easily cooled.
- the converter according to the invention advantageously supports the short circuit and protects the fuel cell.
- the constraints of the various components are such that it is necessary to use a combination of elementary components in parallel and / or in series to perform the various functions desired.
- the switch based on MOSFETs must be able to switch very quickly, have a negligible wiring parasitic inductance (so as not to slow down the growth rate of the currents and not to dissipate the energy stored in this parasitic inductance), have a very low on-state resistance and be able to transfer these heat losses to a dissipator without overheating.
- this function is then necessarily performed by putting several components in parallel in order to be able to achieve a parasitic inductance and sufficiently low wiring.
- the advantages of using standard components are, among others: - lower cost than using less common components; - the advantage of many suppliers for obtaining the components;
- the electrical converter according to the invention also comprises diode rectifier means.
- the diodes of the rectifier means are mounted in series or in the form of an array of diodes. This allows the use of standard industrial components that can offer very high speed.
- the speed of a diode is characterized by the reverse recovery time, that is to say the time during which the diode lets the current flow in reverse and is not yet able to block it. This phase gives rise to many losses.
- the reverse recovery time is all the more important the higher the voltage withstand of the diode.
- FIG. 1 represents the voltage variation across the terminals of a fuel cell depending on the current supplied by the battery
- - Figure 2 shows a first example of a fuel cell voltage regulation circuit according to the prior art
- FIG. 3 represents a second example of a fuel cell voltage regulation circuit according to the prior art
- FIG. 4 represents a first example of converter used in association with a voltage regulation circuit according to the prior art
- FIG. 1 represents the voltage variation across the terminals of a fuel cell depending on the current supplied by the battery
- - Figure 2 shows a first example of a fuel cell voltage regulation circuit according to the prior art
- FIG. 3 represents a second example of a fuel cell voltage regulation circuit according to the prior art
- FIG. 4 represents a first example of converter used in association with a voltage regulation circuit according to the prior art
- FIG. 1 represents the voltage variation across the terminals of a fuel cell depending on the current supplied by the battery
- - Figure 2 shows a first example of a fuel cell voltage regulation circuit according to the prior art
- FIG. 3 represents a
- FIG. 5 represents a second example of converter used in association with a voltage regulation circuit according to the prior art
- 6 shows an electrical converter block diagram for, fuel cells according to the invention
- - Figure 7 shows the variation of the output voltage of the electric converter according to the invention as a function of the current supplied by the fuel cell
- FIG. 8 represents a first example of an electrical converter for a fuel cell according to a first embodiment of the invention
- FIG. 9 represents a second example of an electrical converter for a fuel cell according to the first embodiment of the invention
- FIG. 10 represents an electrical converter for a fuel cell according to a second embodiment of the invention
- FIG. 11 represents an electrical converter for a fuel cell according to a third embodiment of the invention.
- FIG. 6 represents a block diagram of an electrical converter for fuel cell according to the invention and FIG. 7 represents the output voltage Vout of an electrical converter for fuel cell according to the invention as a function of the current I output current inverter means.
- the converter comprises a step-down chopper 1, a current inverter 2, a transformer 3, a rectifier 4, a filtering capacitor 5 and a control circuit 6.
- the step-down chopper 1 includes, for example, a switch 7 , a self-induction 8 and a diode 9.
- the control circuit 6 controls the switch of the step-up chopper and the switches (not shown in FIG. 6) of the current inverter 2.
- a setpoint of threshold voltage Vs and a maximum current setpoint Imax are applied to the control circuit 6.
- three zones of variation of the voltage Vp of the fuel cell can be distinguished, namely, an activation zone of the electrodes of the cell (I), a zone of resistance (II) and a diffusion zone (III) (cf. figure 7).
- the switch 7 of the step-down chopper is regularly switched, from the state passing to the blocked state and vice versa, to let the current delivered chopped and thus lower the input voltage of the inverter.
- the conduction times of the inverter switches can be fixed.
- the switch 7 switches last until the voltage Vp reaches the threshold voltage nx Vs (n being the transformation ratio of the transformer) which then corresponds to the passage from the activation zone (I) to the zone resistance (II).
- nx Vs n being the transformation ratio of the transformer
- the switch 7 of the step-down chopper is kept constantly closed.
- the average voltage at the input of the current inverter is then equal to the voltage Vp across the fuel cell.
- the current inverter is controlled so that the peak voltage which it delivers is substantially equal to the threshold voltage Vs.
- the conduction phases of the switches of the current inverter are then controlled for this purpose by the control circuit.
- the output voltage of the converter Vout is thus substantially equal to the voltage Vs multiplied by the transformation ratio n of the transformer.
- the switch 7 is kept closed as long as the voltage delivered by the fuel cell changes in the resistance zone (II).
- the switch of the step-down chopper 7 switches to limit the output current of the converter and, thus, allow the short-circuit withstand and protect the battery.
- the set value Imax is chosen so that the maximum current which the battery can supply before the voltage of the battery collapses is not reached.
- FIG. 8 represents a first example of an electrical converter according to a first embodiment of the invention.
- the converter comprises a step-down chopper 1, a current inverter 2, a transformer 3, a rectifier 4, a filtering capacitor 5 and a control circuit 6.
- the step-down chopper 1 is made up a switch 7, an inductor 8 and a freewheeling diode 9.
- the current inverter 2 is mounted at the output of the step-down chopper 1. It includes a bridge of four switches 10, 11, 12, 13.
- the high frequency alternating current supplied by the current inverter 2 is applied to the primary winding 14 of the transformer 3.
- the transformer 3 is preferably a step-up transformer intended to bring the voltage from the battery to a level suitable for the application.
- the secondary winding of the transformer 15 is connected to the rectifier 4 which rectifies the current flowing through the secondary winding to supply it to the filtering capacitor 5.
- the voltage taken at the terminals of the current inverter 2 is zero in the phase of simultaneous conduction of the switches which make it possible to carry out the voltage rise.
- the control circuit 6 controls this phase of simultaneous conduction so that the voltage across the terminals of the inverter is equal to Vs when one or the other diagonal of the current inverter is conducting.
- the switch 7 switches to limit the current.
- FIG. 9 shows a second example of an electrical converter for a fuel cell according to the first embodiment of the invention
- the transformer 3 has two secondary windings 17 and 18 which have identical numbers of turns and which are connected in series.
- the rectifier 4 consists of two diodes 19 and 20.
- the two windings in series associated with the two diodes constitute a rectifier system with transformer midpoint known per se.
- FIG. 10 represents an electrical converter for a fuel cell according to a second embodiment of the invention.
- the transformer 3 comprises two primary windings 23, 24 connected in series and having the same number of turns. The ends of the coils 23 and 24 are connected to the positive terminals of the respective switches 21 and 22 controlled by the control circuit 6.
- the voltage of the midpoint of the coils 23, 24 is zero when the two switches 21 and 22 conduct. It is equal to Vs when only one of the two switches is conducting. When a switch is conducting, the voltage across the terminals of the conducting switch is zero, the voltage at the midpoint is equal to Vs and the voltage across the terminals of the other switch which is then open is equal to 2Vs, due to the transformer coupling.
- the transformer secondary can be single, associated with a rectifier with four diodes, or made up of two windings with the same number of turns associated with two diodes.
- FIG. 11 represents an electrical converter for a fuel cell according to a third embodiment of the invention.
- the converter includes two transformers, the secondaries of which are connected in parallel.
- the two primary windings of the transformer must be very well coupled together. Likewise, these two windings must have a very good coupling with the secondary winding (s).
- the diagram in FIG. 11 presents the advantages of using only two switches and of not requiring transformers having two primary windings which have to be very well coupled together.
- the two transformers 26 and 27 have a single primary winding and one or more secondary very well coupled to this single primary. These two transformers are much simpler in technical implementation.
- planar transformers which use windings made up of cut copper strips or printed circuits can be used. These transformers can be very well cooled and are therefore well suited for high frequency operations. This allows a gain in compactness of the converters.
- the use of planar technology made possible by this assembly also allows cost savings during volume productions.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Fuel Cell (AREA)
- Dc-Dc Converters (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0301476A FR2851091B1 (en) | 2003-02-07 | 2003-02-07 | ELECTRICAL CONVERTER FOR FUEL CELL |
FR0301476 | 2003-02-07 | ||
PCT/FR2004/050042 WO2004073147A2 (en) | 2003-02-07 | 2004-02-04 | Electric converter for fuel cell |
Publications (1)
Publication Number | Publication Date |
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EP1590869A2 true EP1590869A2 (en) | 2005-11-02 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP04707964A Withdrawn EP1590869A2 (en) | 2003-02-07 | 2004-02-04 | Electric converter for fuel cell |
Country Status (6)
Country | Link |
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US (1) | US7791915B2 (en) |
EP (1) | EP1590869A2 (en) |
JP (1) | JP4441529B2 (en) |
CN (1) | CN1748348A (en) |
FR (1) | FR2851091B1 (en) |
WO (1) | WO2004073147A2 (en) |
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US11522460B2 (en) | 2020-07-24 | 2022-12-06 | Cirrus Logic, Inc. | Optimizing the control of a hysteretic power converter at low duty cycles |
US11183849B1 (en) | 2020-07-29 | 2021-11-23 | Cirrus Logic, Inc. | Control of power converter based on dynamic constraint factors |
US11522440B2 (en) | 2020-07-29 | 2022-12-06 | Cirrus Logic, Inc. | Use of shared feedback among two or more reactive schemes |
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US11735942B2 (en) | 2020-07-29 | 2023-08-22 | Cirrus Logic Inc. | Maintaining operation within a stable region of a power curve of a power converter |
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2003
- 2003-02-07 FR FR0301476A patent/FR2851091B1/en not_active Expired - Fee Related
-
2004
- 2004-02-04 JP JP2006502173A patent/JP4441529B2/en not_active Expired - Fee Related
- 2004-02-04 US US10/543,977 patent/US7791915B2/en not_active Expired - Fee Related
- 2004-02-04 CN CNA2004800037388A patent/CN1748348A/en active Pending
- 2004-02-04 WO PCT/FR2004/050042 patent/WO2004073147A2/en active Search and Examination
- 2004-02-04 EP EP04707964A patent/EP1590869A2/en not_active Withdrawn
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
---|---|
US20060170570A1 (en) | 2006-08-03 |
CN1748348A (en) | 2006-03-15 |
FR2851091A1 (en) | 2004-08-13 |
US7791915B2 (en) | 2010-09-07 |
WO2004073147A2 (en) | 2004-08-26 |
JP4441529B2 (en) | 2010-03-31 |
WO2004073147A3 (en) | 2005-01-13 |
FR2851091B1 (en) | 2005-03-11 |
JP2006518981A (en) | 2006-08-17 |
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